/**
 * 解析字符串
 */
export function decode (s) {
  try {
    s = decodeURIComponent(s)
  } catch (e) {}
  return s
}

export const encode = encodeURIComponent

/**
 * 解析 query
 */
let cache = {}
export function qsParse (query = location.search): any {
  if (cache[query]) return cache[query]

  let params = {}
  query = query.replace(/^\?/, '')
  const queryArr = query.split('&')
  const len = queryArr.length
  for (let i = 0; i < len; i++) {
    let [k, v] = queryArr[i].split('=')
    k && (params[decode(k)] = decode(v || ''))
  }
  cache[query] = params
  return params
}

/**
 * object 反序列化成 string
 */
export function qsStringify (o): string {
  let s: string[] = []
  for (let i in o) {
    s.push(`${i}=${encode(o[i])}`)
  }
  return s.join('&')
}

/**
 * 安全
 */

export function escapeHtml (s) {
  return s.replace(/&/g, '&amp;')
          .replace(/'/g, '&#39;')
          .replace(/"/g, '&quot;')
          .replace(/</g, '&lt;')
          .replace(/>/g, '&gt;')
          .replace(/\//g, '&#x2f;')
}

export function escapeJs (s) {
  return String(s)
          .replace(/\\/g, '\\\\')
          .replace(/'/g, '\\\'')
          .replace(/"/g, '\\"')
          .replace(/`/g, '\\`')
          .replace(/</g, '\\74')
          .replace(/>/g, '\\76')
          .replace(/\//g, '\\/')
          .replace(/\n/g, '\\n')
          .replace(/\r/g, '\\r')
          .replace(/\t/g, '\\t')
          .replace(/\f/g, '\\f')
          .replace(/\v/g, '\\v')
          .replace(/\b/g, '\\b')
          .replace(/\0/g, '\\0')
}